Process of making alkali perborates.



UNITED sT rEs PATENT OFFICE.

OTTO LIEBKNECHT, OF FRANKFORT-ON-THE-MAIN, GERMANY, IASSIGNOR TO THE ROESSLER & HASSLACHER CHEMICAL COMPANY, OF NEW YORK, N. Y., A CORPORATION or NEW YORK.

PROCESS OF MAKING A LKALI PERBORATES.

Patented Jan. 29, 1906.

Original application filed February 7, 1906, Serial No. 299,901. Divided and this application filed October 26, 1906.

Serial No. 340,687.

filed February 7, 1906.

- My invention relates to a new process of making alkali perborates which has proved easy in operation and of a high degree of efficiency. I have discovered that if an alkali peroxid, such as sodium peroxid, in solu- I 5 tion or in suspension in water, is treated with boracic acid or an alkali borate, such as borax and carbonic acid or any other substance containing the carbonic acld, such as an al-' kali bicatbonate-for instance, sodium bicarbonatesodium perborate is formed and precipitated in an alkaline solution. As a result of-my process-besides the sodium perborate a pure concentrated solution of sodium carbonate is obtained, which can be used for 2 5 other purposes.

In the following I have described two methods as illustrations of ways of carrying out my process, the features thereof being more particularly pointed out hereinafter in the claims.

The following examples will clearly illusr trate two ways of carrying out my process:

1. Six hundred and thirt parts of boracic acid are stirred into four .t iousand parts of water, and then seven hundred and eighty parts of sodium peroxid are added, together with sufficient ice, so that no increase in temperature takes place. .Then gradually add nine hundred and fifty parts of sodium bicar- 0 bonate in powdered form and at the same time ice-water or ice in such quantities that at the end of the operation the temperature of the mixture is preferably from 0 to 2 contigrade and the amount of liquid is about fourteen thousand I parts. The reaction of this example is I-LBO Na,,O NaI-IUO, NaBQ, Na CO 2H,,().

It is' preferable to stir the mixture. during the entire operatiouf, Alter the reactioiiis com-- pleted the precipitated perborate may be separated from the sodium-carbonate solution, washed out, and dried in the usual manner.

2. Onehundred and fifty-six parts of sodium peroxid are stirredfinto about four hundred parts of Water, suflicient ice being added to avoid an increase in temperature. Then one hundred and ninety-five arts of borax (Na,B,,O +10H O). are adde and carbonic acid or dust-free waste gases containing earbonicv acid a're'passedinto the mixture until fifty cubic centimeters of a filtered sample discolors but five to ten cubic centimeters of a one-fifth normal potassium permanganate solution after an addition of sulfuric acid. The reaction of this example is A surplus of carbonic acid is not harmful, as the same does not decompose the alreadyformed perborate. The further steps of the Operation may be carried out as in the exam le numbered 1.

n the examples stated as illustrative of means of carrying out the process it is obvious that many variations may be practiced Without departing from the spirit of my invention. l or instance, sodium peroxid may be replaced by other alkali peroxid, such as sodium otassium peroxid or potassium peroxid, as on as there is enou h sodium in the form of a salt present to produce sodium perborate as a result of the reaction. Instead 'of boracic acid other alkali borates may be used, and instead of sodium bicarbonate other alkali bicarbonates, such as potassium carbonate, may be used. I do not restrict myself to the proportions stated or to the particular substances named.

What claim, and desire to secure by Lettors Patent of the United States, is

1. The process of making alkali perborates 9 5 which consists in reacting on boracic acid with an alkali peroxid and an alkali bicarbonato.

2. The .process of making sodium perborate which consists in reacting on borecic acid with sodium peroxid and an alkali bicarbonate.

3; Theprooessof making sodium perbo l I rate which consists in reactin on boracic acid- I my'name in the presence of't wo'subscrfiing with an alkali peroxid an sodium bica'r- Witnesses. I

bo'nate. 1 OTTO LIEBKNEGH D.

5 4].,T116 process of making'sodiumperbo rate which consists in reacting onboraoic; acid; with sodium peroxid and sodium bicarbonate.

', Witnesses:

-. HORST ZIEGLER JEAN GRUND.

In witness whereof'I hsve hereunto si -ned I 

